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Author Topic: Tweaked Layout  (Read 71656 times)
Kevster
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« Reply #135 on: November 10, 2011, 12:57:47 PM »

I saved a link to this thread because I thought it was such a brilliant idea.  Well my FM50 ME is here, it's a great amp, is currently up and running on the bench, and I've tamed the bulk of the ice-pick highs via the RG-400 cables with the C-lator.  I'm currently running the amp through the speaker an old Crate amp as a test/break-in thing, but an EVM-12L is in the future.  That being said, the amp is not blooming that much yet. I have at least 40-50 hours on it so far, but that aspect of the amp hasn't come to life as of yet.

So I think the 12-way switch mod is going to get done. I'll replace the unused ground switch on the back with the rotary switch and make use of a dead spot on the back.  If "bloom" doesn't come alive with that, then Plan B is to modify the slope resistor.  That's where I'm a little undecided.  I would think that throwing another resistor on top of the stock 150K slope resistor would drop that resistance by an appropriate amount.  The best thing, you could temporarily clip on different resistors to dial in the right resistance (essentially, "voice" that aspect of the amp).  Once the "optimum" (I know, subjective) value is found, then solder it in parallel and go.... 

Well, these two ideas got me thinking a bit.  Would a little variation in the slope resistor (either up or down in resistance) be adviseable?  I know bloom isn't feedback per se, but most amps that I've played that had good bloom could also feedback a bit if the guitar was too close, amp was too loud, etc...  Might it be a good idea to put a trimmer or small toggle to give me some limited options?  If tweaking the amp to add bloom does make it somewhat more prone to feedback, then having the option to "switch" off the additional resistor would return it to stock and theoretically return it to a less feedback prone configuration.  Am I off track about this?

Thanks for any input... 
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Pickmaster
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« Reply #136 on: November 10, 2011, 02:45:52 PM »

Let’s forget for a moment about RG-400 cable and C-lator. Let’s make amp sound great without the additional gizmos. Afterwards it will sound fantastic with them as well.
1. Change 100k slope resistor to 68k 2watt. – bit more lower mids, compression and touch sensitivity.
2. add second 250pf capacitor to B2 tube, do not remove B1 250pf !!!
3. Put 3 way switch on master volume with OFF, 33, and 64pf caps.
4. Change RATIO’s (X) feeding 150k resistor to 10k and following 0,005mf cap to 0,01. You will thank me later.
5. Change MID-BOOST’s 390pf cap to 470, sweeter tone.
6. 12 way rotary is a very useful addition.

Good luck
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burst59
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« Reply #137 on: November 15, 2011, 02:26:45 PM »

Would these mods be us full with my OTS 50?
Also I was wondering if it would be possible to convert my 50 watt to a 100 watt.
I have the extra tube slots, I'm guessing a transformer swap would be the next step.





Let’s forget for a moment about RG-400 cable and C-lator. Let’s make amp sound great without the additional gizmos. Afterwards it will sound fantastic with them as well.
1. Change 100k slope resistor to 68k 2watt. – bit more lower mids, compression and touch sensitivity.
2. add second 250pf capacitor to B2 tube, do not remove B1 250pf !!!
3. Put 3 way switch on master volume with OFF, 33, and 64pf caps.
4. Change RATIO’s (X) feeding 150k resistor to 10k and following 0,005mf cap to 0,01. You will thank me later.
5. Change MID-BOOST’s 390pf cap to 470, sweeter tone.
6. 12 way rotary is a very useful addition.

Good luck

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"You know what would make a good story? Something about a clown who makes people happy, but inside he's real sad. Also, he has severe diarrhea"
Jack Handy
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« Reply #138 on: November 17, 2011, 08:45:17 AM »

Yes, it will work for the OTS 50.
You have to definitely change an output transformer for a bigger one. I would change a power transformer as well, To much work though. Sad
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bigwebb83
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« Reply #139 on: January 30, 2012, 03:45:48 PM »

guys, can someone try to describe to me what these mods do for the clean channel?
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MrBluesStrat
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« Reply #140 on: January 31, 2012, 04:39:09 PM »


Yes that's an interesting question!

guys, can someone try to describe to me what these mods do for the clean channel?
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bigwebb83
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« Reply #141 on: February 15, 2012, 04:41:11 PM »

I'll paypal anyone who can get me a soundclip of a strat on the clean channel of a regular ots with the jzucker mods TEN DOLLARS!!!  Seriously,  I know thats not a lot but I would really like to get some sonic feedback before diving into this.
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